Article (Scientific journals)
Vibrational properties and stabilization mechanism of the amorphous phase of doped GeTe
Raty, Jean-Yves; Noé, Pierre; Ghezzi, G. et al.
2013In Physical Review. B, Condensed Matter and Materials Physics, 88 (1)
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Keywords :
Ab Initio Molecular Dynamics; Phase Change Materials; Infrared
Abstract :
[en] Doping chalcogenide phase change materials was shown to improve the stability of the amorphous phase at high temperature and to strongly increase the crystallization temperature. In this work, we use ab initio molecular dynamics together with Fourier transform infrared spectroscopy to address the stabilization of GeTe doped with nitrogen and carbon in the amorphous phase. The comparison between the simulation and experimental results allows in-depth understanding of the mechanisms. The inclusion of C and N leads to an increase in high frequency vibrational modes and to a lowering of the boson peak intensity. The reduction of the density of floppy vibrational modes and the computed increase of the mechanical rigidity are responsible for the higher activation energy for crystallization. The mechanism described here could apply more generally to stabilize other Ge-Sb-Te phase change materials and ionocovalent glasses at high temperature. © 2013 American Physical Society.
Research center :
Physique des Solides, Interfaces et Nanostructures
Disciplines :
Physics
Author, co-author :
Raty, Jean-Yves  ;  Université de Liège - ULiège > Département de physique > Physique de la matière condensée
Noé, Pierre;  CEA, LETI, MINATEC Campus, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France
Ghezzi, G.;  CEA, LETI, MINATEC Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
Maîtrejean, S.;  CEA, LETI, MINATEC Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
Bichara, C.;  CNRS-CINAM, Campus de Luminy, Case 913, F13288 Marseille, Cedex 9, France
Hippert, F.;  LMGP, CNRS Grenoble-INP, MINATEC, 3 parvis Louis Néel, 38016 Grenoble Cedex 1, France, LNCMI, CNRS UJF UPS INSA, 25 rue des Martyrs, 38042 Grenoble Cedex 9, France
Language :
English
Title :
Vibrational properties and stabilization mechanism of the amorphous phase of doped GeTe
Publication date :
2013
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Physical Society, United States - Maryland
Volume :
88
Issue :
1
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
A.R.C. Themoterm
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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